老年慢性气管炎是危害广大劳动人民健康的一种常见病。目前,对于它的病理变化发生和发展规律的认识还很不够。例如,在慢性气管炎时,通常看到的病理变化有:上皮细胞的改变(柱状上皮增生和鳞状化生、杯状细胞增多等),粘膜下层的腺体增殖以及纤维组织增生,炎症细胞浸润等。但是,对这些变化发生 Elderly chronic bronchitis is a common disease that endangers the health of working people. At present, the understanding of the occurrence and development of its pathological changes is not enough. For example, in the case of chronic bronchitis, pathological changes commonly seen include changes in epithelial cells (columnar epithelial hyperplasia and squamous metaplasia, goblet cells, etc.), proliferation of submucosal glands and proliferation of fibrous tissue, inflammatory cells Infiltration and so on. However, these changes happen